Improvement in air-feeding attachments for locomotives



'W. S. HUTGHINSON. Air-Feeding Attachment for Locomotives.

No. 197,730. Patented Dec. 4,1877.

Wx Mona 13ml Km wc 777L454 YWQ L N.PETERS, PHOTQ-LITHOGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

WILLIAM S. HUTCHINSON, OF CHICAGO, ILLINOIS.

IMPROVEMENT m AIR-FEEDING ATTACHMENTS FOR LOCOMOTIVES.

Specification forming part of Letters Patent N0. 197,730, dated December 4, 1877; application filed October 10, 1877.

To all whom it may concern:

Be it known that I, WILLIAM S. HUrcHIN- SON, of Chicago, county of Cook, State of Illinois, have invented or discovered a new and useful Improvement in Air-Feeding Attach ment for Locomotives; and I do hereby declare the following tobe a full, clear, concise, and exact description thereof, reference being had to the accompanying drawing, making a part of this specification, in which-like letters indicating like parts Figure 1 is a perspective view of an ordinary locomotive fire-box and boiler, showing my improved attachment for consuming the smoke therein. Fig. 2 shows a vertical longitudinal section of the same in the line a; w of Fig. 1; and Fig. 3 is an enlarged view of a vertical section through the injecting device in the line 2 z, Fig. 1.

My improvement relates to an arrangement of devices for consuming the smoke and aiding combustion in locomotive fireboxes and other kindred heating-chambers by forcing into, or onto, or a little above the burning fuel ajet of mingled air and steam.

In the drawing, A represents an ordinary locomotive fire-box, and B an ordinary flueboiler connected therewith. As shown in Fig. 2, the fire-box A is made of an inner and outer casing, 01, a, between which are provided water-chambers b, which are constructed and arranged in the usual way.

The opening for charging the fire-box is shown at c, and the usual grate-bars for supporting the fuel at d. Openings 0 are made through the walls of the fire-box, in any desired number, and arranged, by preference, on all sides of the fire, a little above the level of the burning fuel. Hollow stay-bolts s are employed to connect the inner and outer casings a a at these openings 6, leaving an annular space, in which are secured tubes or conduitpipes r, by means of jam-nuts n, or in other convenient way.

A steam-pipe, w, with stop-cock w, leads from the upper part of the boiler or steamchamber, and connects with a pipe, 42, which passes around the fire-box a little below the tubes or conduit-pipes r.

Nozzles 0 lead off from the pipe o by the ordinary T-connection, and project a little way within the tubes 1", as seen in Fig. 3. The outer ends of the tubes or conduits 1' are left open, so as to furnish a free passage for air about the nozzles o.

It is well known that mingled air and steam are far more efficient in aiding combustion than either used alone; and I have found by practical experiment that, in order to secme the best results in mingling and introducing these two elements into a combustion-chamber, the conduit-tubes 1 should be of considerable length, or,.in any case, longer than the thickness of the walls of an ordinary locomotive fire-box, so that sufficient space may be left between the discharging end of the nozzles o and the common opening at the inner wall a for developing a positive inward current of air by the action of the steam-jet. These devices, thus arranged, will not only act as a siphon to introduce air and steam to the fire-box, but they also operate to thoroughly mingle the two before they are thus introduced.

These tubesr extend beyond the outer wall a, and are bent down in the form of an elbow. By this construction I economize space, and at the same time am enabled to make the pipes of alength sufficient to insure a positive draft of air, and also a thorough mingling of the air with the steam, in a simple and effective manner. As the steam-jet nozzles enter these pipes at their lower open ends, the current of air will be in an upward direction until it reaches the upper arm of the elbow-pipe.

I am aware that pipes with elbows have been made in connection with furnaces, and

that numerous devices have been employed for creating drafts and for insuring a perfect mingling of the steam and air; but I am not aware that an arrangement of pipes similar to mine has been before made.

I claim herein as my invention In combination with the box A, constructed with flue-boiler B and water-chambers b, the pipes r, secured within tubular bolts between the walls a a of the water-chambers, and bent down upon the exterior of the outer wall at r, as shown, and the steam-jet nozzles 0, ar-

ranged around the box below the flue, and near the base of the box, so as to enter the lower open ends of the pipes 1" below the bends r,

all of the said parts being constructed and arranged as herein shown and specified.

In. testimony whereof I have hereunto set w my hand.

WILLIAM S. HUTOHIN SON Witnesses: I I

J. J. MCCORMICK,

GLAUTDIUS L. PARKER. 

